Mithun, Inc., commonly referred to as Mithun, is a multidisciplinary professional services firm headquartered in the city of Seattle in Washington state in the United States of America offering integrated design services related to architecture, land use planning, landscape architecture, interior architecture, interior design, and "cultural audits" with a focus on sustainability.
The firm was founded in 1949 by Omer Mithun, a professor of architecture at the University of Washington as a private practice in Bellevue, Washington. Mithun incorporated in 1953, and became Mithun Partners in 1988. The practice moved into the historic Times Square Building in 1990, after the firm outgrew the space they moved again in 2000, after renovating their present-day headquarters on Pier 56. Mithun is now led by a board of directors, presided by Bert Gregory, FAIA, who also serves as CEO.
- Epler Hall at Portland State University - six-story, 65,000-square-foot (6,000 m2) dormitory 
- IslandWood (formerly the Puget Sound Environmental Learning Center) (2002) - LEED-NC Gold rated. Nationally recognized project and environmental case study featuring low-impact construction, recycled materials, photovoltaics and a custom-designed LivingMachineTM to treat grey-water and black-water on site.
- REI Flagship Store (1996) - "the apotheosis of the exposed-viscera school of architecture -- all the building's structural guts are on glorious exhibit, from the electric conduits to the I-beams and turnbuckles that hold everything together." 
Research & Planning
- Blue Ring (1999) - Seattle's open space strategy for the Center City. The two reports Blue Ring, The Next Decade and Blue Ring, the Next 100 Years were conceived as a companion to the Olmsted Brothers' green ring of parks and parkways that encircle Seattle.
- Center for Urban Agriculture(2007) - conceptual design of an off-grid 318-unit multi family building that is energy and water self-sufficient by utilizing on site greenhouses, rooftop gardens, a chicken farm, and areas for growing vegetables and grains. The design exercise won "Best of Show", lauded as "most visionary" in the Cascadia Region Green Building Council's Living Building Challenge.
- Lloyd Crossing Sustainable Urban Design Plan (2004)- includes onsite and offsite strategies contribute to the capability of a 35-block ecosystem in Portland, Oregon, USA, emulating the natural systems of a pristine forest, even as the area's density increases fivefold. The plan received national recognition including the American Institute of Architects 2006 Institute Honor Awards for Regional and Urban Design, a 2005 AIA/COTE Top Ten Green Projects 
- Marga Rose Hancock Hon. AIA. "Honors Archive: Omer Mithun FAIA 1918-1983". AIA Seattle. Retrieved 2008-05-15.
- Macaulay, David R. (2008). Integrated Design - Mithun. Bainbridge Island, Washington: Ecotone Publishing. pp. 11–22. ISBN 978-0-9749033-9-2.
- Earth Share of Washington. "Mithun & the Environment - An Interview with Bert Gregory". Green Business. Earth Share of Washington. Retrieved 2008-05-15.[dead link]
- "HPB CaseStudy: Overview - IslandWood". High Performance Buildings Case Studies. BuildingGreen, LLC. 21 December 2006. Retrieved 2008-05-15.
- Cascadia Green Building Council (2002-04-22). "Puget Sound Environmental Learning Center" (PDF). Retrieved 2008-05-15.
- "Seattle Visitor's Guide: REI Flagship Store (1996)". Seattle Post-Intelligencer. Retrieved 2008-05-15.[dead link]
- Seattle Daily Journal of Commerce (9 December 1999). "Mithun Partners". Top Projects of the Century in Washington State. Retrieved 2008-05-15.
- "Seattle Department of Planning and Development - CityDesign Projects". Retrieved 2008-05-15.
- "ASLA 2003 Analysis and Planning Honor Award". Retrieved 2008-05-15.
- Katie Zemtseff (1 May 2007). "Mithun and Perkins + Will win green design contest". Seattle Daily Journal of Commerce. Retrieved 2008-05-15.
- Jacob Resneck (17 September 2007). "Mithun Urban Farms". CoolHunting. Retrieved 2008-05-15.
- "Mithun Wins Prestigious AIA Honor Award for Lloyd Crossing" (Press release). Portland Development Commission. 2006-01-18. Retrieved 2008-05-15.
- "AIA/COTE Top Ten Green Projects: Lloyd Crossing Sustainable Design Plan". Retrieved 2008-05-15.
- Enlow, Clair (July 2005). "A Green Blueprint". Metropolis Magazine 2005 (August/September).